The Optoma TX631-3D bring the finest images to schools and businesses with high contrast ratio to ensure easy-to-read text and high brightness for excellent graphics even in rooms with ambient light. This DLP Projectorector series integrates the features that businesses want (including a choice of WXGA or XGA resolutions, an HDMI connector and 3D compatibility) and supports larger audiences with a built-in 7-watt speaker system. A top-loading lamp design streamlines maintenance and saves time. Meanwhile, a built-in closed captioning decoder displays text from videos that have closed captioning embedded in the signal without requiring additional components. Key Features  .stars-off, .stars-on { position: relative; height: 16px; background: url(/webresources/scripts/jquery.ui.stars-3.0/jquery.ui.stars.gif) repeat-x 0 -32px;} .stars-on { position: absolute; background-position: 0 -48px;} 0.0 out of 0 reviews - Add a Review > --> Share everything, from lessons to presentations, and deliver superior text and images— 3500 ANSI lumens brightness and 10,000:1 contrast ratio Easily add closed-caption content without installing additional components Streamline administration with network control and management via RS-232 or RJ45 ports Create a rich, engaging and vivid viewing experience with 3D capabilities